Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c54d5ec157b11f…

MALICIOUS

PDF

68.9 KB Created: 2021-09-05 01:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 835a8052195201c2c58a4ae2e9305a4f SHA-1: 72ffc970ab03ea3027beb7622b83520904fccec1 SHA-256: e4c54d5ec157b11f4ea64df69a506c13679882d753d5004f33d5a4dc1d38177f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links likely serve as a distribution point for phishing attempts or further malware. The PDF itself does not contain readable content, but its structure and embedded links are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/uoq4khpmsosvj7f6pd456dj475/magemebetelufewunubu.pdf In PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers/file/6637588401.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae318f38422---sigewupuf.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/81180122094.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/mulofojor.pdfIn PDF document text
    • http://theponghop.com/upload/files/77269115685.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/89947711353.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2c54ce597---88814827646.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/d5b345c001158766aba85fa717710666/71135948516.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/supopodav.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/65996274905.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/10766394283.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/60300814560.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/malizejewuduxevigogi.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/71859318851.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/2a582e695239ffc7b73495fe6c1f560f/fexafudal.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/4db94fb31ce3b9da9d15b83536835cd9/27923829259.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/1386282925.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078712e94321---nisatuzapuxoxunuj.pdfIn PDF document text
    • http://abroadster.com/files/26888389624.pdfIn PDF document text
    • https://expomediainc.com/upload/file/gatafinofoxigowuko.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610d3e4ae4b48---51401834611.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f161366b14---33915873124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=penang+bus+map+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB27A 14340 bytes
SHA-256: 0bf130f23219da605bc8e7a1e5cadfe1aed51b3b238830d5a6c2301c4c4e6ace
font_01_sfnt_off0000d62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62A 10628 bytes
SHA-256: 41925979a8d7468266c8a3226be40547e3bbcc232eff2530c1df660f887a05a4
font_02_sfnt_off0000ee06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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